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Finding the Fourth Proportional to 606.45, 909.80 and 221.70

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Solution

The fourth proportional to 606.45, 909.80 and 221.70 is: 332.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    606.45 : 909.80 = 221.70 : x
  2. Step 2: Convert to fraction form
    606.45/909.80 = 221.70/x
  3. Step 3: Cross multiply
    606.45x = 909.80 × 221.70
  4. Step 4: Simplify right side
    606.45x = 201,702.66
  5. Step 5: Solve for x
    x = 201,702.66/606.45
  6. Step 6: Final answer
    x = 332.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.